Yes, it can be parsed many many ways. I am happy to look at it other ways, but here are the quick hits for the season.

The order as presented for each is average # of cars, standard deviation between shows, max # of cars, min # of cars.

If there are 2 sets of data, it means the 2nd has shows dropped. That is for Auto City (minus 2 Top Speed), Berlin (1 Top Speed), Springport (2 Top Speeds but does include MI cup), Spartan (1 Top Speed, but does include harvest), Owosso (minus nationals), Whittemore (minus 1 top speed but does include invitational). Note  there were a couple shows that were cancelled after cars showed up. Those are all included, as they were not really outliers from the rest of the data.